You are reading an old version of the documentation (v3.1.0). For the latest version see https://matplotlib.org/stable/api/_as_gen/matplotlib.axes.Axes.xaxis_inverted.html
Version 3.1.0
matplotlib
Fork me on GitHub

matplotlib.axes.Axes.xaxis_inverted

Axes.xaxis_inverted(self)

Return whether the x-axis is inverted.

The axis is inverted if the left value is larger than the right value.